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Twitter added only 4 million new users in the fourth quarter. But CEO Dick Costolo says the social network is already turning that around in the current quarter, and the company is projecting at least 4.5% growth this quarter in consumers using the social network.

Twitter added only 4 million new users in the fourth quarter. But CEO Dick Costolo says the social network is already turning that around in the current quarter, and the company is projecting at least 4.5% growth this quarter in consumers using the social network.